const app = getApp()
var QR = require('../../utils/qrcode.js')
Page({
  data: {
    visitorsList:{},
    maskHidden: true,
    imagePath: '',
  },

  onLoad:function(options) {
    //访客数据
    var index = options.index
    this.setData({
      visitorsList:app.globalData.visitorsList[index]
    })

    var size = this.setCanvasSize(); //动态设置画布大小
    var uuid = app.globalData.visitorsList[index].uuid;
    console.log("uuid",app.globalData.visitorsList[index].uuid)
    this.createQrCode(uuid, "mycanvas", size.w, size.h);
  },
 
  //适配不同屏幕大小的canvas
  setCanvasSize: function () {
    var size = {};
    try {
      var res = wx.getSystemInfoSync();
      var scale = 750 / 686; //不同屏幕下canvas的适配比例；设计稿是750宽
      var width = res.windowWidth / scale;
      var height = width; //canvas画布为正方形
      size.w = width;
      size.h = height;
    } catch (e) {
      // Do something when catch error
      console.log("获取设备信息失败" + e);
    }
    return size;
  },


  
  createQrCode: function (url, canvasId, cavW, cavH) {
    //调用插件中的draw方法，绘制二维码图片
    QR.api.draw(url, canvasId, cavW, cavH, this, this.canvasToTempImage);
    // setTimeout(() => { this.canvasToTempImage();},100);

  },
  //获取临时缓存照片路径，存入data中
  canvasToTempImage: function () {
    var that = this;
    wx.canvasToTempFilePath({
      canvasId: 'mycanvas',
      success: function (res) {
        var tempFilePath = res.tempFilePath;
        console.log(tempFilePath);
        that.setData({
          imagePath: tempFilePath,
        });
      },
      fail: function (res) {
        console.log(res);
      }
    }, that);
  },
  //点击图片进行预览，长按保存分享图片
  previewImg: function (e) {
    var img = this.data.imagePath;
    wx.previewImage({
      current: img, // 当前显示图片的http链接
      urls: [img] // 需要预览的图片http链接列表
    })
  },
})
